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<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>练习</title>
    <style>
        body {
            background-color: rgba(144, 150, 147, 0.507);
        }
        
        .big {
            width: 1200px;
            height: 600px;
            background-color: rgb(255, 255, 255);
            margin: 0 auto;
            position: relative;
            z-index: -3;
            top: 200px;
        }
        
        .box1 {
            width: 450px;
            height: 590px;
            background-color: rgb(38, 34, 55);
            position: absolute;
            right: 200px;
            top: -50px;
            z-index: -2;
        }
        
        .box1-1 {
            color: rgb(255, 255, 255);
            padding-top: 150px;
            padding-left: 50px;
        }
        
        .box1-2 {
            background-color: rgb(255, 255, 255);
            width: 100px;
            height: 20px;
            margin-top: 30px;
            margin-left: 50px;
            text-align: center;
        }
        
        .box1-2-1 {
            color: rgb(16, 255, 255);
        }
        
        .wengzi {
            width: 200px;
            margin-left: 50px;
            color: gray;
        }
        
        .box2 {
            position: absolute;
            left: 230px;
            top: 100px;
            z-index: -1;
            box-shadow: 0px 0px 20px rgb(160, 160, 160);
        }
        
        .box3 {
            width: 350px;
            height: 250px;
            background-color: rgb(238, 208, 203);
            position: absolute;
            left: 250px;
            bottom: -60px;
            z-index: 0;
            box-shadow: 0px 0px 20px rgb(238, 208, 203);
        }
        
        .box3-1 {
            color: hotpink;
            padding-top: 20px;
            padding-left: 30px;
        }
        
        .wengzi2 {
            width: 200px;
            margin-left: 30px;
            color: rgb(27, 27, 27);
        }
        
        .box3-2 {
            border: 3px solid rgb(255, 255, 255);
            width: 160px;
            height: 30px;
            margin-left: 30px;
            text-align: center;
        }
        
        .box3-2-1 {
            color: rgb(255, 255, 255);
            margin: 0 auto;
        }
    </style>
</head>

<body>
    <div class="big">
        <div class="box1">
            <h1 class="box1-1">主标题</h1>
            <p class="wengzi">First of all, it's still a concept.It's important to talk about inline elements and block-level elements.</p>
            <div class="box1-2">
                <p class="box1-2-1">
                    emmmmm
                </p>

            </div>
        </div>
        <img class="box2" src="https://via.placeholder.com/350x350" alt="">
        <div class="box3">
            <h1 class="box3-1">标题2</h1>
            <p class="wengzi2">Many HTML developers are not programmers, but JavaScript</p>
            <div class="box3-2">
                <p class="box3-2-1">
                    emmmmm
                </p>
            </div>
        </div>


    </div>



</body>

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